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Double line may refer to:Double-track railway, a type of railway with two tracks, usually involving running a track in each direction
Double line automatic signalling, a form of railway signalling used on the majority of double track sections in New Zealand
Double-lined mackerel, Grammatorcynus bilineatus, a species of Spanish mackerel
Double-lined spectroscopic binary, a type of binary star: see Binary star#Spectroscopic binaries
Mythimna turca, common name the double line, a moth of the family Noctuidae
In algebraic geometry, a certain family of conics
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